//
//  StatusCell.swift
//  新浪微博
//
//  Created by 焦林生 on 15/11/10.
//  Copyright © 2015年 焦林生. All rights reserved.
//

import UIKit

//微博cell中控件的间距数值
let StatusCellMargin: CGFloat = 12
//微博头像的宽度
let StatusCellIconWidth: CGFloat = 35

//微博cell
class StatusCell: UITableViewCell {

    //微博视图模型
    var viewModel: StatusViewModel? {
    
        didSet {
        //设置视图模型
            topView.viewModel = viewModel
            
            contentLabel.text  = viewModel?.status.text
            
            pictureView.viewModel = viewModel
            //测试动态修改行高
            pictureView.snp_updateConstraints { (make) -> Void in
                make.width.equalTo(pictureView.bounds.width)
                make.height.equalTo(pictureView.bounds.height)
            }
            
        }
    }
    /**
    根据视图模型计算行高
    
    - parameter vm: 视图模型
    
    - returns: 返回行高
    */
    func rowHeight(vm: StatusViewModel) -> CGFloat {
    
        // 1. 记录视图模型 -> 会调用上面的 didSet 设置内容以及更新`约束
        viewModel = vm
        
        //2 强制更新所有约束
        contentView.layoutIfNeeded()
        
        //3 返回底部视图的最大高度
        return CGRectGetMaxY(bottomView.frame)
    }
    
    //MARK: 构造函数
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier:reuseIdentifier )
        
        setupUI()
        selectionStyle = .None
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    //MARK: 懒加载控件
    //顶部视图
    private lazy var topView: StatusCellTopView = StatusCellTopView()
    //微博正文标签
    lazy var contentLabel: UILabel = UILabel(title: "微博正文",
        fontSize: 15,
        color: UIColor.darkGrayColor(),
        screenInset: StatusCellMargin)
    
    //配图视图
    lazy var pictureView: StatusCellPictureView = StatusCellPictureView()
    
    
    //底部视图 
    lazy var bottomView: StatusCellBottomView = StatusCellBottomView()
    
   

}
// MARK: - 设置界面
extension StatusCell {

     func setupUI() {
        // 1. 添加控件
        contentView.addSubview(topView)
        contentView.addSubview(contentLabel)
        contentView.addSubview(pictureView)
        contentView.addSubview(bottomView)
       
        
        // 2. 自动布局
        // 1> 顶部视图
        topView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(contentView.snp_top)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(2 * StatusCellMargin + StatusCellIconWidth)
        }
        // 2> 内容标签
        contentLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(topView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left).offset(StatusCellMargin)
            
        }
       
        
        //4> 底部视图
        bottomView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(pictureView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(44)
            
        }
        
        
    }
}
